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I have a couple of oil pans with the spring in place - a couple others using the keeper between bolts on the oil pump screen.
The pan-spring appears "rolled" into the plug fitting. And no, it's not like it can be "unscrewed" - although you could try it.
Maybe better than trying to "force it" instead use a dremel or die-grinder and cut it off as flush as you can get it? Be careful lest you heat the plug fitting as it may be soldered into the pan and you might create a leak.
Not that you can't fix a leak by re-soldering - been there done that after spinning the fitting in place in overtightening.
Or - you might leave it and use it. Perhaps try to "stretch it out" to increase the spring rate? If it doesn't come loose you might be good to go. There is not really pressure forcing the pump down into the pan. All a stock pump does is "lift" oil up to the valve chamber level.
Joe K